\\[-1.8ex] Soil Heterogeneity & $-$0.290$^{*}$ & $-$0.206 & $-$0.217 & $-$0.120 & $-$0.264 & $-$0.074 \\ 
  & (0.168) & (0.161) & (0.146) & (0.143) & (0.161) & (0.132) \\ 
\\[-1.8ex] 
Observations & 14,601 & 14,601 & 14,601 & 14,601 & 14,601 & 14,601 \\ 
R$^{2}$ & 0.611 & 0.634 & 0.627 & 0.651 & 0.615 & 0.662 \\ 
